initial commit / add all books

9 files changed, 169 insertions, 0 deletions

diff --git a/3835/CH7/EX7.1/Ex7_1.sce b/3835/CH7/EX7.1/Ex7_1.sce
new file mode 100644
index 000000000..f73a34a72
--- /dev/null
+++ b/3835/CH7/EX7.1/Ex7_1.sce
@@ -0,0 +1,16 @@
+ clear
+//
+//case a
+f=150
+p=2
+//assume the diameter of the stator bore is d meter
+n=120*50/2  //where n is rotor speed
+printf("\n n= %0.0f  rpm",n)
+pi=3.14
+d=(120*60)/(%pi*3000)  
+printf("\n D= %0.3f  m",d)
+//case b
+k=2
+l=1
+o=k*d**2*n*l
+printf("\n output of the alternator= %0.3f  KVA",o)
diff --git a/3835/CH7/EX7.10/Ex7_10.sce b/3835/CH7/EX7.10/Ex7_10.sce
new file mode 100644
index 000000000..d3bd45e9a
--- /dev/null
+++ b/3835/CH7/EX7.10/Ex7_10.sce
@@ -0,0 +1,19 @@
+clear
+//
+//case a
+vl=11000
+il=50
+pf=0.85 //powerfactor
+p=vl*il*pf
+printf("\n Power supplied to the motor is= %0.5f  kW",p)
+//case b
+vt=6350.85 //at angle 0 
+zs=25.02 //at angle 0
+//subcase 1 powerfactor at 0.85 lag
+//e=vt-ia*zs
+//e=6350.85-50(at angle -31.79)*25.02(at angle 87.71)
+//substituting and solving as in x+iy form we get 5744.08 at angle -10.39 as the value of e
+printf("\n emf induced=5744.08 at angle -10.39")
+//subcase 2
+//for a 0.85 lead same process as above is followed except angles are considered positive due to lead
+printf("\n emf induced=7051.44 at angle -8.88")
diff --git a/3835/CH7/EX7.2/Ex7_2.sce b/3835/CH7/EX7.2/Ex7_2.sce
new file mode 100644
index 000000000..b2a9d7e93
--- /dev/null
+++ b/3835/CH7/EX7.2/Ex7_2.sce
@@ -0,0 +1,17 @@
+clear
+//
+//The total number of cycles the clock should perform in 24 hours for correct time is
+t=24*60*60*50
+printf("\n The total number of cycles the clock should perform in 24 hours for correct time is= %0.0f  ",t)
+//The number of cycles the clock performs from 8am to 7pm is
+n=(6*49.95+5*49.90)*60*60
+printf("\n The number of cycles clock performs from 8am to 7pm is= %0.0f  ",n)
+//the number of cycles required in remaining 13 hours is t-n that is 2342.88*10**3
+a=(2342.88*10**3)/(13*60*60)
+printf("\n The desired average frequency for correct time for remaining 13 hours is= %0.5f  ",a)
+//The shortfall in number of cycles from 8am to 7pm
+s=0.05*6+0.10*5
+printf("\n s= %0.3f  ",s)
+//The time by which the clock is incorrect at 7pm
+time=(0.8*60*60)/50
+printf("\n time= %0.5f  ",time)
diff --git a/3835/CH7/EX7.3/Ex7_3.sce b/3835/CH7/EX7.3/Ex7_3.sce
new file mode 100644
index 000000000..d79884553
--- /dev/null
+++ b/3835/CH7/EX7.3/Ex7_3.sce
@@ -0,0 +1,21 @@
+clear
+//
+//given
+n=500 //speed to rotation
+p=12  //poles
+//case a
+f=n*p/120  //frequency
+printf("\n frequency= %0.0f  Hz",f)
+//case b
+kp=1  //kp is the winding at full pitch
+//kd is the distribution factor where kd=sin[mk/2]/msin(k/2) where k is a gama function
+//m=108/12*3
+m=3
+//gama or k=180/slots per pole=9 k=20
+//after substituting above values in kd we get kd=0.96
+//z=108*12/3 = 432
+ep=2.22*1*0.96*432*50*50*10**-3
+printf("\n Phase emf= %0.3f  v",ep)
+//case c
+vl=3**0.5*ep
+printf("\n The line voltage is= %0.3f  v",vl)
diff --git a/3835/CH7/EX7.4/Ex7_4.sce b/3835/CH7/EX7.4/Ex7_4.sce
new file mode 100644
index 000000000..ef1d8f874
--- /dev/null
+++ b/3835/CH7/EX7.4/Ex7_4.sce
@@ -0,0 +1,18 @@
+clear
+//
+//given
+f=50 //frequency
+p=10 //number of poles
+//case a
+n=120*f/p
+printf("\n n= %0.0f  rpm",n)
+//case b
+//the pitch factor kp=0.966
+//m=2 and gama=180/slots per pole and it is obtained as 30
+//kd=sin[(mgama)/2]/msin(gama/2)=0.966
+z=6*2*10
+ep=z*2.22*0.966*0.966*50*0.15
+printf("\n phase emf= %0.5f  v",ep)
+//case c
+el=3**0.5*ep
+printf("\n the line voltage= %0.3f  v",el)
diff --git a/3835/CH7/EX7.6/Ex7_6.sce b/3835/CH7/EX7.6/Ex7_6.sce
new file mode 100644
index 000000000..744e43c05
--- /dev/null
+++ b/3835/CH7/EX7.6/Ex7_6.sce
@@ -0,0 +1,21 @@
+clear
+//
+//given
+zs=4 // at angle 84.26
+xs=3.98
+impangle=84.26
+//case a
+//vt=2200+j0
+//ia=120
+//e=vt+ia*zs
+//on substituting and calculating we get the value of e as 2298.17 at 12 degrees
+p=((2298.17-2200)/2200)*100
+printf("\n %0.3f ",p)
+//case b
+//performing same functions as above for pf leading 0.8 we get e=1994.63 at 12 degrees
+p=((1994.63-2200)/2200)*100
+printf("\n %0.3f ",p)
+//case c
+//same as above but pf lags by 0.707 and on calculating generates e as 2589.53
+p=((2589.53-2200)/2200)*100
+printf("\n %0.3f ",p)
diff --git a/3835/CH7/EX7.7/Ex7_7.sce b/3835/CH7/EX7.7/Ex7_7.sce
new file mode 100644
index 000000000..50e484644
--- /dev/null
+++ b/3835/CH7/EX7.7/Ex7_7.sce
@@ -0,0 +1,22 @@
+clear
+//
+//From the circuit diagram of the figure we can obtain tha following equations based on which the problems are solved
+//eqn 1..........vl=(i1+i2)*zl....the load voltage
+//eqn 2..........vl=e1-i1*z1=e2-i2*z2
+//eqn 3..........i1=(e1-vl)*y1 and i2=(e2-vl)*y2
+//eqn 4..........vl=(e1*y1+e2+y2)/(y1+y2+yl)
+//load voltage case a
+//vl=209.26-j*9.7 in x+iy form and angle is calculated 
+vl=(209.26**2+9.7**2)**0.5
+printf("\n load voltage= %0.5f  v",vl)
+//using eqn 3 the following generator currents are generated
+//i1=7.45-j5.92 for which i1=9.52 at angle -38.45 is generated
+//i2=8.91-j7.17 for which i2=11.43 at angle -38.83 is generated
+//case b
+//the load current il=i1+i2 is obtained as 20.95 at angle -38.65
+printf("\n the load current is 20.95 at angle -38.65")
+//case c
+g1=220*9.52
+g2=220*11.43
+printf("\n The output of generator1= %0.3f  VA",g1)
+printf("\n The output of generator2= %0.4f  VA",g2)
diff --git a/3835/CH7/EX7.8/Ex7_8.sce b/3835/CH7/EX7.8/Ex7_8.sce
new file mode 100644
index 000000000..2cef4ef73
--- /dev/null
+++ b/3835/CH7/EX7.8/Ex7_8.sce
@@ -0,0 +1,21 @@
+clear
+//
+//case a
+//case 1
+v=6600  //voltage
+ir=200  //armature current
+xs=8   //reactance
+e=(v**2+(ir*xs))**0.5
+printf("\n E= %0.5f  V",e)
+//case 2
+//from triangle in the firgure the power angle is obtained as 13.63
+printf("\n The power angle=13.63")
+//case b
+//due to excitation we obtain ix=217.10A
+//case 3
+ix=217.10
+i=((ir**2+ix**2))**0.5
+printf("\n Armature current= %0.5f  A",i)
+//case 4
+//power factor cos(angle)=ir/i=0.68
+printf("\n power factor=0.68")
diff --git a/3835/CH7/EX7.9/Ex7_9.sce b/3835/CH7/EX7.9/Ex7_9.sce
new file mode 100644
index 000000000..829bc4b60
--- /dev/null
+++ b/3835/CH7/EX7.9/Ex7_9.sce
@@ -0,0 +1,14 @@
+clear
+//
+//this problem has few notations and values taken from problem above
+//case a
+//the generator output becomes 1.5*6600*200
+o=1980 //generator output
+//the power angle is obtaimed as 16.42
+//applying cosine to the triangle in the problem gives ixs=2853.02
+//hence armature current is
+i=2853.02/8
+printf("\n armature current= %0.5f  A",i)
+//case b
+pf=1980000/(6600*356.63) //power factor=o/(V*I)
+printf("\n power factor= %0.5f  ",pf)